code: def findsource(obj):
      try:
          sourcelines, lineno = inspect.findsource(obj)
      except py.builtin._sysex:
          raise
      except:
          return None, -1
      source = Source()
      source.lines = [line.rstrip() for line in sourcelines]
      return source, lineno
  
imports: from __future__ import generators
  from bisect import bisect_right
  import sys
  import inspect, tokenize
  import py
  from types import ModuleType
label_desc: Use image node_id 3 for calling a global function with example usage: findsource(obj) and returns: source,  lineno, None,  unknown